 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.internal.configurator;


 import java.io.*;
 import java.net.*;

 import javax.xml.parsers.*;

 import org.eclipse.osgi.util.NLS;
 import org.xml.sax.*;
 import org.xml.sax.helpers.*;

 /**
  * Default feature parser.
  * Parses the feature manifest file as defined by the platform.
  *
  * @since 3.0
  */
 public class FeatureParser extends DefaultHandler {

     private SAXParser parser;
     private FeatureEntry feature;
     private URL url;

     private final static SAXParserFactory parserFactory =
         SAXParserFactory.newInstance();

     /**
      * Constructs a feature parser.
      */
     public FeatureParser() {
         super();
         try {
             parserFactory.setNamespaceAware(true);
             this.parser = parserFactory.newSAXParser();
         } catch (ParserConfigurationException e) {
             System.out.println(e);
         } catch (SAXException e) {
             System.out.println(e);
         }
     }
     /**
      * Parses the specified url and constructs a feature
      */
     public FeatureEntry parse(URL featureURL){
         feature=null;
         InputStream in = null;
         try {
             this.url = featureURL;
             in = featureURL.openStream();
             parser.parse(new InputSource(in), this);
         } catch (SAXException e) {
         } catch (IOException e) {
         } finally {
             if (in != null)
                 try {
                     in.close();
                 } catch (IOException e1) {
                     Utils.log(e1.getLocalizedMessage());
                 }
         }
         return feature;
     }

     /**
      * Handle start of element tags
      * @see DefaultHandler#startElement(String, String, String, Attributes)
      * @since 2.0
      */
     public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

         Utils.debug("Start Element: uri:" + uri + " local Name:" + localName + " qName:" + qName); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

         if ("feature".equals(localName)) { //$NON-NLS-1$
 processFeature(attributes);
             // stop parsing now
 throw new SAXException(""); //$NON-NLS-1$
 }
     }

     /*
      * Process feature information
      */
     private void processFeature(Attributes attributes) {

         // identifier and version
 String id = attributes.getValue("id"); //$NON-NLS-1$
 String ver = attributes.getValue("version"); //$NON-NLS-1$

         if (id == null || id.trim().equals("") //$NON-NLS-1$
 || ver == null || ver.trim().equals("")) { //$NON-NLS-1$
 System.out.println(NLS.bind(Messages.FeatureParser_IdOrVersionInvalid, (new String [] { id, ver})));
         } else {
 // String label = attributes.getValue("label"); //$NON-NLS-1$
 // String provider = attributes.getValue("provider-name"); //$NON-NLS-1$
 // String imageURL = attributes.getValue("image"); //$NON-NLS-1$
 String os = attributes.getValue("os"); //$NON-NLS-1$
 String ws = attributes.getValue("ws"); //$NON-NLS-1$
 String nl = attributes.getValue("nl"); //$NON-NLS-1$
 String arch = attributes.getValue("arch"); //$NON-NLS-1$
 if (!Utils.isValidEnvironment(os, ws, arch, nl))
                 return;
 // String exclusive = attributes.getValue("exclusive"); //$NON-NLS-1$
 // String affinity = attributes.getValue("colocation-affinity"); //$NON-NLS-1$

             String primary = attributes.getValue("primary"); //$NON-NLS-1$
 boolean isPrimary = "true".equals(primary); //$NON-NLS-1$
 String application = attributes.getValue("application"); //$NON-NLS-1$
 String plugin = attributes.getValue("plugin"); //$NON-NLS-1$

             //TODO rootURLs
 feature = new FeatureEntry(id, ver, plugin, "", isPrimary, application, null ); //$NON-NLS-1$
 if ("file".equals(url.getProtocol())) { //$NON-NLS-1$
 File f = new File(url.getFile().replace('/', File.separatorChar));
                 feature.setURL("features" + "/" + f.getParentFile().getName() + "/");// + f.getName()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 } else {
                 // externalized URLs might be in relative form, ensure they are absolute
 feature.setURL(Utils.makeAbsolute(Utils.getInstallURL(), url).toExternalForm());
             }

             Utils.
                 debug("End process DefaultFeature tag: id:" +id + " ver:" +ver + " url:" + feature.getURL()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 }
     }
 }

